Patent GB-1256317-A (GB)
Title: Automotive vehicle steering column lock
Inventor: KIMBERLIN DAN REX
IPC: B60R25/02
Filed: 1970-07-16
Abstract: 1,256,317. Vehicle anti-theft devices. GENERAL MOTORS CORP. 16 July, 1970 [1 Aug., 1969], No. 34518/70. Heading B7J. [Also in Division E2] An automotive vehicle steering column lock includes in combination, a steering shaft bolt 40 mounted on a stationary housing 22 for movement along a path extending longitudinally of the column between a locked position engaging a keeper 32 fixed to the rotatable steering shaft element 28 of the column and an unlocked position, a key-operated cylinder lock actuator 66 rotatably mounted on the housing and connected with a switch controlling the vehicle ignition system so as to cause energization of such system when rotated to an "on" position- and de-energization of the system when rotated to "off" and "off-lock" positions, the actuator being further connected with the bolt for unitary movement therewith to locate the bolt in the unlocked position thereof when the actuator is in "off" and "on" positions and to locate the bolt in the locked position thereof in the "offlock" position of the actuator. A blocking member 82 is mounted on the housing for movement between the unblocking positions and the bolt includes a blocking shoulder 98 thereon, the member including a portion 96 movable in a plane generally transverse to the path of movement of the bolt and located in the blocking position of the member 82 within the path of movement of the shoulder to prevent movement of the bolt and actuator from "off" to "off-lock" position. Means bias the member 82 to the blocking position thereof, and the member also includes an operating portion 88 disposed adjacent the actuator in a position with relation thereto permitting manipulation of the member from blocking to unblocking position against the biasing means by one finger of the operator's hand simultaneously with rotation of the actuator by other fingers of the same hand from "off" to "off-lock" position. As shown, the steering column housing 22 includes a reciprocable lock bolt 40 having a tapered head 44, receivable within one of a number of notches 36 in the keeper plate 32 non-rotatably mounted on the steering shaft 28, and a slidable rack member 46 adapted for sliding longitudinally with the lock bolt. The rack has a lateral lug 48 which engages over the shank of the lock bolt and a spring 52 seats between the lug and a shoulder on the lock bolt, the rack teeth 58 meshing with a gear sector 60 rotatably supported in the housing. The latter has mounted therein the casing 68 of a key-operated cylinder 70 lock actuator assembly, the casing mounting a lock cylinder core operative to withdraw a side locking bar 70 from a slot in the casing when the key is inserted into the core 72 and to allow rotation of the core or to extend the bar to within the slot to lock the actuator against core rotation. The core is non-rotatably coupled with the sector 60 so that selected rotation of the lock core by a coded key 74 will reciprocate the rack 46 and bolt 40. The latter are connected by a rod 78 to an ignition and starter system switch and all are movable as a unit by the actuator 66 between a plurality of circuit controlling positions corresponding to various positions of the switch i.e. an "off-lock" and "off" position wherein the ignition system is de-energized, an "on" position wherein the ignition system is energized and a "start" position wherein the vehicle starting system is energized simultaneously with the ignition system. The spring 52, when the bolt head 44 is not aligned with a notch 36, snaps the bolt 40 home within an aligned notch upon slight rotation of the vehicle steering wheel. For preventing inadvertent rotation of the actuator 66 from any of the unlocked positions of the bolt 40 to the "off-lock" position, a blocking lever 82 pivoted at 84, has a portion pivotable within a transverse plane of the steering column intersecting the path of longitudinal movement of the rack 46 and a finger piece 88; the lever includes a leg 90 having blocking portions 92 and 96 functional with respect to shoulders 94 and 98 as the rack 46. In operation, with the bolt in the "off-lock" position, Fig. 3, the blocking portion 96 of lever 82 is pressed by a spring against the undersurface 104 of rack 46 and rotation of actuator 66 by key 74 causes sector 60 to displace the rack 46 to "off", "on" and "start" position. When the rack reaches the "off" position, a spring snaps the lever 82 upwardly so that portion 96 thereof is disposed in path of shoulder 98 and portion 92 is raised out of way of a shoulder 94. Turning off of the ignition system brings the shoulder 98 to the "off" position and into abutting relation with the portion 96, and to lock the steering column pressure applied to the finger piece 88 pivots the lever 82 to remove the blocking portion 96 from path of shoulder 98. To prevent unauthorized attempts to circumvent the blocking operation of the lever 82, i.e. by the finger piece 88 in a depressed condition, the blocking portion 92 of the lever becomes fixed in a depressed state whereby that portion lies in the path of the shoulder 94 to prevent rotation of the actuator 66 and segment 60.